Alright guys so I just bought this g35 and the key keeps getting deleted some how it’ll just stop working and the security light comes on I’ve had it reprogrammed 3 times now and it still does the same thing now the lock smith says he can’t even program it... what do I do?

 

Tow to Nissan for a diagnostic, probably a failing BCM, possibly just the key. Do you only have one key for the car or what?